Long term Bear Market?

I was looking at the monthly and came across this. I averaged out the time frames of bull markets since 1996. On average they were around 4 years. We are currently in that time frame right now. The RSI and MACD are also currently lining up with prior historical tops as well. Be weary at these levels. Also recall every time we were at a prior top the sentiment was overly bullish , much like right now.